Security readout for executives and security teams
Plain-English summary
Cisco Nexus Insights had an access-control flaw that could let a logged-in user download web application files they should not see. This is not described as anonymous internet compromise, but it can expose sensitive information where valid credentials are available or misused.
Executive priority
Treat as a moderate-priority data exposure issue. Urgency rises if Nexus Insights is accessible beyond a tightly controlled admin network or if many users hold valid credentials.
Technical view
The web UI failed to apply proper RBAC filters to file download actions. An authenticated remote attacker with valid device credentials could access directory listing and download functions and retrieve restricted web application files. CVSS 3.1 is 4.3, confidentiality impact only.
Likely exposure
Exposure is limited to Cisco Nexus Insights deployments where the web UI is reachable and an attacker has valid credentials. The provided bundle does not identify affected version ranges.
Exploitation context
The source bundle does not cite active exploitation, and KEV status is false. Exploitation requires authentication, low complexity, no user interaction, and affects confidentiality rather than integrity or availability.
Researcher notes
This maps to CWE-552 and is caused by missing RBAC enforcement on download actions. The bundle lacks affected version details, fixed release information, and independent exploit evidence, so avoid broad claims beyond authenticated information disclosure.
Mitigation direction
- Review Cisco’s advisory for fixed releases or supported remediation guidance.
- Restrict Nexus Insights web UI access to trusted administrative networks.
- Apply least-privilege access for Nexus Insights users and remove unused accounts.
- Monitor for unusual file download or directory access activity in the web UI.
- Prioritize remediation where shared, stale, or broadly scoped credentials exist.
Validation and detection
- Inventory Cisco Nexus Insights deployments and confirm web UI exposure paths.
- Identify all users with valid Nexus Insights credentials and their assigned roles.
- Check Cisco guidance for version applicability and remediation status.
- Review logs for unexpected web UI file download or directory listing activity.
- Confirm RBAC controls prevent unauthorized file access after remediation.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-552: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-34765 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20210901 Cisco Nexus Insights Authenticated Information Disclosure VulnerabilityCVE reference · vendor-advisory, x_refsource_CISCO
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Files or Directories Accessible to External Parties
Files or Directories Accessible to External Parties represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.